Don't clear the framebuffer when not needed.
diff --git a/libs/hwui/OpenGLDebugRenderer.h b/libs/hwui/OpenGLDebugRenderer.h
index ce15512..2ac19ae 100644
--- a/libs/hwui/OpenGLDebugRenderer.h
+++ b/libs/hwui/OpenGLDebugRenderer.h
@@ -34,7 +34,7 @@
     ~OpenGLDebugRenderer() {
     }
 
-    void prepare();
+    void prepare(bool opaque);
     void finish();
 
     int saveLayer(float left, float top, float right, float bottom,